If you don't know what Twitter is, you might very well be missing out on something that is not only necessary but also quite evil.
Though it started as a quick and easy way to keep friend up to date on where you're at and what you're doing, Twitter has rapidly evolved into the craziest collection of internet gurus, budding sex workers, fake celebs, and poseur wannabes... all yammering at each other non-fucking-stop.
Might not be necessary yet, but it will be soon -- or something quite like it. And it's certainly evil because it's more addictive than crack.
There's some real people there too, I think. You could be one of them. Look me up if you do.